Dial



Nov. 6, 1928. 1,690,806

I o. A. ANDERSON DIAL Filed July 13. 1922 fire. 1.

3140mm 0. A A NDE R5 0N.

Patented Nov. 6, 1928.

UNITED STATES OLAF A. ANDERSON, OIE HAMILTON, OHIO.

DIAL.

Application filed July 13,

This invention relates to indexing dials and more particularly to dials adapted for use in connect-ion with radio apparatus.

It is the object of the invention to provide a dial, for the purpose set forth, that will be simple in design and relatively inexpensive to manufacture and which may be conveniently operated for thecoarse adjustments and is also provided with means whereby fine or micrometric adjustments may be accurately and conveniently made.

The invention is illustrated in the accompanying drawings, of which:

Figure 1 is a side elevation of a panel embodying the invention;

Fig. 2 is a transverse section of the same on the line 22 of Fig. 1; and

Fig. 3 is a view similar to Fig. 2, but showing another form of the invention.

Referring to the drawings, 10 indicates a panel through which a shaft 11 projects, this shaft being operatively connected with any device that is to be adjusted by rotation. A conical dial 12 is secured on the shaft 11 and, in order to adapt the dial to shafts of different sizes, Ihave provided it with a relatively large axial bore 13 in which there is a bushing 14, the exterior of the bushing fittin the bore 13 and the interior fitting the sha 11, the parts being secured together by a pin 15 or in any other suitable manner.

The periphery of the dial is provided with a set of graduations 16 which may be arranged to suit the requirements of any particular application of the dial, and the panel 10 is provided with an indexing mark 17 to cooperate with the graduations 16 on the dial for the purpose of locating the position of the latter. For convenience in rotating the dial it is preferably provided with a roughened or milled zone 18.

In order to provide for fine or micrometric adjustments of the dial I provide therein a bore 19 arranged at an angle to the axis of the dial and in this bore there is a shaft 20' having on its inner end a'tip of rubber or other soft friction material 21 adapted to contact with the surface of the panel 10 so that rotation of the shaft 20 will effecta rotation of the dial. For convenience in rotating the shaft 20 it is provided, on the end projecting exteriorly of the dial, with a head 1922. Serial No. 574,836.

22 that is preferably milled or otherwise roughened to facilitate manipulation thereof.

The shaft 20 may be moved longitudinally in the bore119' and because of this provision it is possible to disengage the tip 21from the surface of the panel 10 or by pressing inwardly on the head 22 the pressure of the tip 21 on the. panel may be made such that the frictional engagement of these parts will enable the dial to'be rotated by a rotation of the shaft 20. When coarse adjustments of the dial are desired the milled zone 18 will be grasped by the operator and the dial turned directly and independently of the shaft 20.

The fine adjustments, however, will be made I I by'rotating the shaft 20.

In Fig. 3 I have illustrated a slight modification of the construction illustrated in Figs. 1 and 2 and in this modification a mound or enlargement 23 is provided on the apex of the dial and the conical surface of this mound is milled or roughened for the purpose of facilitating direct rotation of the dial.

This form of construction is preferred for the larger sizes of dials, the other construction being preferred for the smaller sizes.

Having thus described my invention, what I claim is:

1. In a device of the class described, the combination of a rotatable dial of substantially conical form, a member relative to which said rotatable dial moves, and a shaft carried by said dial and arranged at an angle to the axis thereof, said shaft projecting at one end exteriorly of said dial and having its other end in engagement with said member whereby micrometer adjustments of the dial may be made by rotating the shaft.

2. In a device of the class described, the combination of a rotatable dial of substantially conical form, a member relative to which said rotatable dial moves, and a shaft carried by said dial and arranged at an angle to the axis thereof, said shaft havin a head at one end on the exterior of said dialand having a relatively soft friction material on its other end to engage withthe surface of said member and being movable longitudinally in the dial to engage or be disengaged from said surface. 7 v v V 8. The comb nation with a panel and a dial rotatably mounted thereon, of means extending through said dial to contact With said first knob through a small angular distance panel whereby the dial may be rotated, said in response to a larger angular movement of means being accessible for manual operation said second knob, in which said seoondknob 10 from the front of the dial. is movable along its axis to render said means 5 4. A knobhaving provision forattaehment operative and inoperative.

to a rotatable shaft, a knob rotatably mounted In testimony whereof I afiix my signature. on said first knob, and means for moving said OLAF A. ANDERSON. 

